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Julgoldite-(Fe2+)

A valid IMA mineral species
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About Julgoldite-(Fe2+)Hide

07102560015066351065138.jpg
Julian R. Goldsmith
Formula:
Ca2Fe2+Fe3+2[Si2O6OH][SiO4](OH)2(OH)
Colour:
Deep black, greenish black to green in small fragments
Lustre:
Sub-Metallic
Hardness:
Specific Gravity:
3.58 - 3.60
Crystal System:
Monoclinic
Name:
Named for its relationship to julgoldite-(Fe3+).

Julian Royce Goldsmith (26 February 1918, Chicago, Illinois, USA - 23 January 1999, USA), geochemist at the University of Chicago. He was an expert on feldspars and carbonates. He also served as president of the Geochemical Society, the Mineralogical Soeciety of America, and the Geological Society of America.

Unique IdentifiersHide

Mindat ID:
2120
Long-form identifier:
mindat:1:1:2120:9
GUID
(UUID V4):
2c52adce-a588-4a83-9e50-525b178e851c

IMA Classification of Julgoldite-(Fe2+)Hide

Approved
IMA Formula:
Ca2Fe2+Fe3+2(Si2O7)(SiO4)(OH)2 · H2O

Classification of Julgoldite-(Fe2+)Hide

9.BG.20

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
58.2.2.1

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
14.22.8

14 : Silicates not Containing Aluminum
22 : Silicates of Fe and Ca

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
Jul-Fe2+IMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
JulThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of Julgoldite-(Fe2+)Hide

Sub-Metallic
Transparency:
Transparent
Colour:
Deep black, greenish black to green in small fragments
Streak:
Greenish olive with a bluish tinge
Hardness:
4½ on Mohs scale
Tenacity:
Very brittle
Cleavage:
Perfect
{100} and {001}
Density:
3.58 - 3.60 g/cm3 (Measured)    3.56 g/cm3 (Calculated)

Optical Data of Julgoldite-(Fe2+)Hide

Type:
Biaxial (-)
RI values:
nα = 1.776(4) nβ = 1.814(4) nγ = 1.836 - 4.000
2V:
Measured: 50° to 70°, Calculated: 73°
Max Birefringence:
δ = 0.060 - 2.224
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Pleochroism:
Strong
Comments:
X = pale brown; Y = pale brownish green; Z = deep emerald-green.

Chemistry of Julgoldite-(Fe2+)Hide

Mindat Formula:
Ca2Fe2+Fe3+2[Si2O6OH][SiO4](OH)2(OH)

Crystallography of Julgoldite-(Fe2+)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.922(4) Å, b = 6.081(3) Å, c = 19.432(9) Å
β = 97.60(6)°
Ratio:
a:b:c = 1.467 : 1 : 3.196
Unit Cell V:
1,045.02 ų (Calculated from Unit Cell)
Z:
4
Morphology:
fan-shaped, plumose crystal groups; granular.
Twinning:
Twin plane {001}, typically repeated, common.
Comment:
Space Group: A2/m:

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.958 Å(100)
2.780 Å(80)
2.574 Å(80)
1.519 Å(80)
4.817 Å(70)
3.859 Å(70)
2.501 Å(60)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 3a: Earth’s earliest Hadean crust>4.50
8 : Mafic igneous rocks
Near-surface Processes
22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23)

Type Occurrence of Julgoldite-(Fe2+)Hide

Place of Conservation of Type Material:
Swedish Museum of Natural History, Stockholm, Sweden; Harvard University, Cambridge, Massachusetts, 109641, 109642; National Museum of Natural History, Washington, D.C., USA, 137014.
Geological Setting of Type Material:
hematite-magnetite ore
Associated Minerals at Type Locality:

Other Language Names for Julgoldite-(Fe2+)Hide

Relationship of Julgoldite-(Fe2+) to other SpeciesHide

Other Members of this group:
Julgoldite-(Fe3+)Ca2Fe3+Fe3+2[Si2O6OH][SiO4](OH)2OMon.
Julgoldite-(Mg)Ca2MgFe3+2[Si2O6OH][SiO4](OH)2(OH)Mon.
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
20 photos of Julgoldite-(Fe2+) associated with CalciteCaCO3
13 photos of Julgoldite-(Fe2+) associated with PrehniteCa2Al2Si3O10(OH)2
5 photos of Julgoldite-(Fe2+) associated with PectoliteNaCa2Si3O8(OH)
4 photos of Julgoldite-(Fe2+) associated with Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
4 photos of Julgoldite-(Fe2+) associated with Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
2 photos of Julgoldite-(Fe2+) associated with Gonyerite(Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8
2 photos of Julgoldite-(Fe2+) associated with GreenockiteCdS
2 photos of Julgoldite-(Fe2+) associated with QuartzSiO2
2 photos of Julgoldite-(Fe2+) associated with DatoliteCaB(SiO4)(OH)
2 photos of Julgoldite-(Fe2+) associated with ChalcedonySiO2

Related Minerals - Strunz-mindat GroupingHide

9.BG.Shuiskite-(Cr)Ca2Cr3+Cr3+2[Si2O6OH][SiO4](OH)2OMon. 2/m : B2/m
9.BG.Alnaperbøeite-(Ce)Ca(Ce2.5Na0.5)(AlAl2Al)[Si2O7][SiO4]3O(OH)2Mon. 2/m : P21/m
9.BG.MagnesiovesuvianiteCa19MgAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9Tet. 4/m : P4/n
9.BG.AlumovesuvianiteCa19AlAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/m : P4/n
9.BG.Zoisite-(Pb)(CaPb)(AlAlAl)O[Si2O7][SiO4](OH)Orth. mmm (2/m 2/m 2/m) : Pnma
9.BG.Vielleaureite-(Ce)(Mn2+Ce)(MgAlMn2+)F[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.Heflikite(CaCa)(AlAlSc)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.Zilbermintsite-(La)(CaLa5)(Fe3+Al3Fe2+)[Si2O7][SiO4]5O(OH)3Mon. 2/m : P21/m
9.BG.05bAllanite-(Ce)(CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(La)(CaLa)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Y)(CaY)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon.
9.BG.05aClinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bDissakisite-(Ce)(CaCe)(AlAlMg)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Dollaseite-(Ce)(CaCe)(MgAlMg)F[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05aEpidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05aHancockite(CaPb)(AlAlFe3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Khristovite-(Ce)(CaCe)(MgAlMn2+)F[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05aMukhinite(CaCa)(AlAlV3+)O[Si2O7][SiO4](OH)Mon.
9.BG.05aPiemontite(CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Piemontite-(Sr)(CaSr)(AlAlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bManganiandrosite-(La)(Mn2+La)(Mn3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Tweddillite(CaSr)(Mn3+AlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bFerriallanite-(Ce)(CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Niigataite(CaSr)(AlAlAl)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Manganiandrosite-(Ce)(Mn2+Ce)(Mn3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Dissakisite-(La)(CaLa)(AlAlMg)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Vanadoandrosite-(Ce)(Mn2+Ce)(V3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Uedaite-(Ce)(Mn2+Ce)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05aEpidote-(Sr)(CaSr)(AlAlFe3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Nd)(CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bUnnamed (Mg-analogue of Ferriallanite-(Ce))(CaCe)(Fe3+AlMg)O[Si2O7][SiO4](OH)
9.BG.05bUnnamed (Mn3+-analogue of Ferriakasakaite-(Ce))(CaCe)(Mn3+AlMn2+)O[Si2O7][SiO4](OH)
9.BG.05bFerriallanite-(La)(CaLa)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bÅskagenite-(Nd)(Mn2+Nd)(AlAlFe3+)O[Si2O7][SiO4]OMon. 2/m : P21/m
9.BG.05Piemontite-(Pb)(CaPb)(AlAlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bVanadoallanite-(La)(CaLa)(V3+AlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Ferriandrosite-(La)(Mn2+La)(Fe3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Androsite-(Ce)(Mn2+Ce)(AlAlMn2+)O[Si2O7][SiO4](OH)
9.BG.05a vUnnamed (Ga-analogue of Epidote)(CaCa)(AlAlGa3+)O[Si2O7][SiO4](OH)
9.BG.05bUM1989-32-SiO:AlCaFeHREE(Ca0.50.5REE)(AlAlFe3+)O[Si2O7][SiO4](OH)
9.BG.05bManganiakasakaite-(La)(CaLa)(Mn3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bFerriakasakaite-(Ce)(CaCe)(Fe3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.9.BG.Ferriakasakaite-(La)(CaLa)(Fe3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.9.BG.Ferriandrosite-(Ce)(Mn2+Ce)(Fe3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.9.BGFerriperbøeite-(Ce)CaCe3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2Mon. 2/m : P21/m
9.BG.10Zoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)Orth. mmm (2/m 2/m 2/m) : Pnma
9.BG.15MacfalliteCa2Mn3+3(SiO4)(Si2O7)(OH)3Mon. 2/m : P21/m
9.BG.15SursassiteMn2+2Al3(SiO4)(Si2O7)(OH)3Mon. 2/m : P21/m
9.BG.20OkhotskiteCa2Mn2+Mn3+2[Si2O6OH][SiO4](OH)2(OH)Mon. 2/m
9.BG.20Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH,O)2 · H2OMon. 2/m
9.BG.20Pumpellyite-(Fe3+)Ca2Fe3+Al2(Si2O7)(SiO4)(OH,O)2 · H2OMon. 2/m
9.BG.20Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2OMon. 2/m
9.BG.20Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon. 2/m
9.BG.20Shuiskite-(Mg)Ca2MgCr3+2[Si2O6OH][SiO4](OH)2(OH)Mon. 2/m
9.BG.20Julgoldite-(Fe3+)Ca2Fe3+Fe3+2[Si2O6OH][SiO4](OH)2OMon.
9.BG.20Pumpellyite-(Al)Ca2Al3(Si2O7)(SiO4)(OH,O)2 · H2OMon. 2/m
9.BG.20PoppiiteCa2V3+V3+2[Si2O6OH][SiO4](OH)2OMon. 2/m : B2/m
9.BG.20Julgoldite-(Mg)Ca2MgFe3+2[Si2O6OH][SiO4](OH)2(OH)Mon.
9.BG.25GanomalitePb9Ca5Mn(Si2O7)4(SiO4)OHex. 6 : P6
9.BG.25WayneburnhamitePb9Ca6(Si2O7)3(SiO4)3Hex. 6 : P6
9.BG.30RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2Mon. 2/m : B2/b
9.BG.35VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35WiluiteCa19MgAl4(Al,Mg)8(B,◻)4◻[Si2O7]4[(SiO4)10]O(O,OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35ManganvesuvianiteCa19Mn3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/m : P4/n
9.BG.35FluorvesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(F,OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35CyprineCa19Cu2+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9Tet. 4/m : P4/n
9.BG.35HongheiteCa19Fe2+Al4(Fe3+,Mg)8(◻4)B[Si2O7]4[(SiO4)10]O(OH,O)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35Milanriederite(Ca18[REE])Fe3+Al4(Mg4Al4)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35Manaevite-(Ce)(Ca13Ce4[H2O]2)Mg(Al3Mg)(Mg3Ti3Fe3+2)(◻4)◻[Si2O7]4[(SiO4)8(H4O4)2]O(OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.40Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7Mon.
9.BG.45DellaiteCa6Si3O11(OH)2Tric.
9.BG.50Gatelite-(Ce)CaCe3(AlAl2Mg)[Si2O7][SiO4]3O(OH)2Mon. 2/m : P21/b
9.BG.50Perbøeite-(Ce)CaCe3(AlAl2Fe2+)[Si2O7][SiO4]3O(OH)2 Mon. 2/m : P21/m
9.BG.50Ferriperbøeite-(La) CaLa3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2Mon. 2/m : P21/m
9.BG.50Perbøeite-(La)CaLa3(AlAl2Fe2+)[Si2O7][SiO4]3O(OH)2 Mon. 2/m : P21/m
9.BG.55Västmanlandite-(Ce)CaCe3(MgAl2Mg)[Si2O7][SiO4]3F(OH)2Mon. 2/m : P21/m
9.BG.60Radekškodaite-(La) (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3Mon. 2/m : P21/m
9.BG.60Radekškodaite-(Ce)(CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3Mon. 2/m : P21/m
9.BG.60Radekškodaite Group(CaM5)([Fe3+Al3]Fe2+)[Si2O7][SiO4]5O(OH)3

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Julgoldite-(Fe2+)Hide

References for Julgoldite-(Fe2+)Hide

Localities for Julgoldite-(Fe2+)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Germany
 
  • Baden-Württemberg
    • Freiburg Region
      • Lörrach
        • Malsburg-Marzell
70. +1 other reference
      • Ortenaukreis
        • Haslach im Kinzigtal
          • Haslach im Kinzigtal
Walenta (1992)
  • Rhineland-Palatinate
    • Donnersbergkreis
      • Nordpfälzer Land
        • Waldgrehweiler
Poser et al. (2004)
    • Kaiserslautern
      • Otterbach-Otterberg
        • Niederkirchen
Weiß (1990)
    • Kusel
      • Lauterecken-Wolfstein
        • Kreimbach-Kaulbach
Weiß (1990)
  • Saxony
    • Mittelsachsen
      • Bobritzsch-Hilbersdorf
Grütze (2006)
India
 
  • Maharashtra
    • Konkan Division
      • Salsette Island
        • Mumbai Suburban District
          • Malad
Wise and Moller (1990)
    • Nashik Division
Fabre Minerals
Italy
 
  • Sardinia
    • Sassari Province
      • La Maddalena
        • La Maddalena Island
Gamboni (2003)
Japan
 
  • Shimane Prefecture
    • Matsue City
      • Kitaura
Matsubara et al (1992)
Norway
 
  • Møre og Romsdal
    • Fjord
      • Norddal
        • Tafjord
Brastad (1982) +1 other reference
Sweden (TL)
 
  • Värmland County
    • Filipstad
      • Långban Ore District
Moore (1967) +2 other references
Moore (1967) +2 other references
      • Persberg ore district
        • Pajsberg
Nysten (2004)
Ukraine
 
  • Crimea
    • Bakhchysarai
      • Trudolyubovka
Karpenko V. (New Data on Minerals) +1 other reference
USA
 
  • California
    • Trinity County
      • Coastal Range
        • Mad River Rock
Van Nostrand Reinholt Press: 493 +2 other references
  • Connecticut
    • Litchfield County
      • Woodbury
        • Orenaug Hills
Martins da Pedra specimen +1 other reference
 
Mineral and/or Locality  
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